Balance Weights

See also Commands | Parts | Procedures | Troubleshooting

Description | NVS Parameters | Theory of Operation

Description

Offset the weight of the TECs. The position of the balance weight is checked, and moved if necessary, during plate loading. There is a different drum balance assembly on each end of the drum.

Balance weight 1 is at the drive end.
Balance weight 2 is at the encoder end.

The main components of the balance weight assemblies are:

• Balance weights
  • 5080 encoder end (50-1235) BOM | Drawing
  • 5080 pulley end (50-1236) BOM | Drawing
  • 5880 encoder end (50-1318) BOM | Drawing
  • 5880 pulley end (50-1319) BOM | Drawing
  
  Offset the weight of the TEC. The weights are spring loaded to fit into a series of detents around the drum.
  The weights are mounted on a moveable ring with three bearings. The bearings run in Aluminum-bronze races press fitted to hubs on each end of the drum.
  Each weights is held in place by a detent pin that engages with slots on the drum assembly. For each end of the drum, the extension of the drum balance actuation cylinder releases the detent and holds the balance assembly in place such that upon spinning the drum the weights can be moved relative to the drum.
  There are 36 detent positions around the drum. The distance between each detent is 1000 encoder ticks.



• Actuating assemblies
  • Actuator, pulley end: BOM and Drawing
  • Actuator, encoder end, 5080: BOM and Drawing
  • Actuator, encoder end, 5880: BOM and Drawing
  
  Retrieve and insert the weight in a detent position. The release tip at the end of the cylinder fits into the weight. Mounted to the clamp plate assembly on the encoder end. Mounted to the drum pin pillow block on the drive end.



• Hall effect sensor
  Detects the extend position of the balance weight actuator.
  In future units, both the extend and retract positions will be checked.



• Reed switch
  Detects the presence of the balance weight. The reed switch is activated by a small magnet. The magnet for the encoder end is mounted on the balance weight assembly. The magnet for the pulley end is glued on the weight. The switch is on the actuating cylinder mounting bracket

NVS parameters

AL module

al b1so (bal1_sensor_offset)
al b2so (bal2_sensor_offset)
al bdo (balance_detent_offset)
al bes (bal_cyl_ext_sensor)
al brs (bal_cyl_ret_sensor)
al bsv (balance_search_vel)
al bto (balance_tec_offset)
al bwi (balance_is_installed)
al cbw (check_balance_weights)

AL module

altim bwst (balance_find_timeout)
altim bwt (balance_cyl_timeout)

Theory of operation

VLF Platesetter Plate Loading Sequence
VLF Platesetter Plate Unloading Sequence